DNA Nanostructure-assisted Construction Of Nanomaterials With Optical/Electrical Properties

DNA has worked as the genetic material of creatures for a long time since the development of DNA nanotechnology which made DNA brandly new applications.Especially the emergency of DNA tile technology and DNA origami made DNA an ideal molecular for building any 1D、2D and 3D nanometer-scale structures with the aid of computers.On account of the complementary base pair rule,self-assembled DNA nanostructures by ‘bottom-up’ method can be precisely controlled on the nanometer scale in shape.DNA nanostructures are fabulous in biocompatibility,addressability and easily-modification.With all these intrigue properties,DNA nanostructures hold promise for versatile applications.DNA-based template co-assembled with metal nanoparticles are advance in photonics,bioassay and photothermology.DNA-based drug delivery system improves cargo-loadings,site-targeting,and controlled-release.Fine designed DNA-based templates with/ without modification of specific groups can direct synthesis of substances which make them attractive in biomineralization,trace element detection,and electricity.This research consists of two aspects: 1.DNA nanostructures as templates are co-assembled with metal nanoparticles and light-matter interaction is explored.2.DNA nanostructures as templates are used to direct the controllable growth of polyaniline and its conductive performance is studied.The main contents are as follows:Chiral cross gold nanorods are prepared by square DNA origami.To enhance coupling capability of chiral structures and adjust the wavelength of the CD signal,silver layers with specific thickness are coated on the surfaces of the structures.Then TDBC,a fluorescent dye,is adsorbed to the silver-decorated chiral nanostructures by electrostatic force.Our work is to explore the interaction of chiral plasmon and TDBC fluorescence.Our findings show that the UV/CD signals of self-assembled chiral nanostructures can be precisely controlled.There is a potent interaction between plasmon and exciton when TDBC was wrapped.A splitting of UV spectrum and CD was observed at maximum absorption wavelength.DNA templates variaty in lengths,widths and with different number of G-quadruplex are prepared.The conductive polyaniline nanowires are obtained which lengths are over200 nm,with uniform and specific thickness by changing the condition of reactions.Then the conductive property is studied.There are four kinds of DNA tile templates arefabricated.The stability was improved by increasing the sticky end base pairs and UV irradiation.The optimal synthesizing conditions were determined through control variables method.Finally,a high current signal was detected on the DNA-PANI composite material for the first time.